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http://elar.urfu.ru/handle/10995/90759
Название: | Spiral arms and instability within the AFGL 4176 mm1 disc |
Авторы: | Johnston, K. G. Hoare, M. G. Beuther, H. Kuiper, R. Kee, N. D. Linz, H. Boley, P. Maud, L. T. Ahmadi, A. Robitaille, T. P. |
Дата публикации: | 2020 |
Издатель: | EDP Sciences |
Библиографическое описание: | Spiral arms and instability within the AFGL 4176 mm1 disc / K. G. Johnston, M. G. Hoare, H. Beuther, R. Kuiper, et al. . — DOI 10.1051/0004-6361/201937154 // Astronomy and Astrophysics. — 2020. — Iss. 634. — aa37154-19. |
Аннотация: | We present high-resolution (30 mas or 130 au at 4.2 kpc) Atacama Large Millimeter/submillimeter Array observations at 1.2 mm of the disc around the forming O-type star AFGL 4176 mm1. The disc (AFGL 4176 mm1-main) has a radius of ∼1000 au and contains significant structure, most notably a spiral arm on its redshifted side. We fitted the observed spiral with logarithmic and Archimedean spiral models. We find that both models can describe its structure, but the Archimedean spiral with a varying pitch angle fits its morphology marginally better. As well as signatures of rotation across the disc, we observe gas arcs in CH3CN that connect to other millimetre continuum sources in the field, supporting the picture of interactions within a small cluster around AFGL 4176 mm1-main. Using local thermodynamic equilibrium modelling of the CH3CN K-ladder, we determine the temperature and velocity field across the disc, and thus produce a map of the Toomre stability parameter. Our results indicate that the outer disc is gravitationally unstable and has already fragmented or is likely to fragment in the future, possibly producing further companions. These observations provide evidence that disc fragmentation is one possible pathway towards explaining the high fraction of multiple systems around high-mass stars. © ESO 2020. |
Ключевые слова: | ACCRETION ACCRETION DISKS CIRCUMSTELLAR MATTER STARS: FORMATION STARS: MASSIVE TECHNIQUES: INTERFEROMETRIC VELOCITY ARCHIMEDEAN SPIRAL ATACAMA LARGE MILLIMETER/SUB-MILLIMETER ARRAYS CONTINUUM SOURCE HIGH RESOLUTION HIGH-MASS STARS LOCAL THERMODYNAMIC EQUILIBRIUM MULTIPLE SYSTEMS STABILITY PARAMETERS GIANT STARS |
URI: | http://elar.urfu.ru/handle/10995/90759 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор SCOPUS: | 85087410030 |
Идентификатор WOS: | 000514472000002 |
Идентификатор PURE: | 12253899 |
ISSN: | 0004-6361 |
DOI: | 10.1051/0004-6361/201937154 |
Сведения о поддержке: | Deutsche Forschungsgemeinschaft, DFG Russian Science Foundation, RSF: 18-72-10132 Horizon 2020: CSF-648505 European Research Council, ERC Acknowledgements. We thank the referee for their comments which improved this manuscript, and John Ilee for useful discussions. AA and HB acknowledge support from the ERC under Horizon 2020 via ERC Consolidator Grant CSF-648505. H. B. also acknowledges support from the DFG in the Collaborative Research Center (SFB 881) “The Milky Way System” (subproject B1). RK acknowledges support via his Emmy Noether Research Group funded by the DFG under grant no. KU 2849/3-1 and KU 2849/3-2. PB acknowledges support by the Russian Science Foundation (grant 18-72-10132). |
Карточка проекта РНФ: | 18-72-10132 |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
Файлы этого ресурса:
Файл | Описание | Размер | Формат | |
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10.1051-0004-6361-201937154.pdf | 1,82 MB | Adobe PDF | Просмотреть/Открыть |
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